<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>hello</title>
    <script>
       let a = 10;
       let b = 20;

       a = b;

       const PI = 3.145315456456566;


       const arr = [6,7];
       arr[0] = 10;

       let newArr = [15,80,33,20];


       let heima60 = 5;//

       let newHeima60 = 6;//

       let result = heima60 | newHeima60;

       console.log("result:"+result);


    </script>
</head>
<body>

</body>
</html>